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发明名称
ISDN, basic rate interface arranged for quad voice
摘要
申请公布号
US4970723(A)
申请公布日期
1990.11.13
申请号
US19880251483
申请日期
1988.09.30
申请人
AT&T BELL LABORATORIES
发明人
LIN, T. P.
分类号
H04Q3/58;H04Q11/04
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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